DTC P0102, P0103
DTC P0102: Mass Air flow (MAF) Sensor Circuit Low Voltage
DTC P0103: Mass Air flow (MAF) Sensor Circuit High Voltage
General Description
The mass airflow (MAF) sensor is attached to the intake air passage, and it measures the amount of intake airflow. The MAF sensor is a hot wire airflow meter. The airflow cools the electrically heated wire that is mounted in the air passage. The powertrain control module (PCM) determines the amount of intake airflow by detecting the current that is required to keep the hot wire at a constant temperature. The lower limit of the MAF sensor output is specified. If the output is below that limit, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 2.0 seconds or more |
| DTC Type | One drive cycle, MIL on |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
DTC: P0102
The MAF sensor output voltage [MAF Sensor Voltage] is 0.10 V or less for at least 2.0 seconds.
DTC: P0103
The MAF sensor output voltage [MAF Sensor Voltage] is 4.89 V or more for at least 2.0 seconds.
[ ]: HDS Parameter
Possible Cause
DTC: P0102
- MAF sensor VGP line short to ground
- MAF sensor VGP line open
- MAF sensor power supply line open
DTC: P0103
- MAF sensor VGM line open
Common
- MAF sensor failure
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.